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SubjectRe: [PATCH] trim memory not covered by WB MTRRs


On Wed, 6 Jun 2007, Randy Dunlap wrote:

> On Wed, 6 Jun 2007 15:28:43 -0700 Jesse Barnes wrote:
>
>> On Wednesday, June 6, 2007 3:26 pm Justin Piszcz wrote:
>>> Nope, I booted with only netconsole= options. I have a lot of HW in
>>> the box and I guess the buffer is too small. Not sure where to
>>> change it in the kernel. Looking..
>>
>> It's called "kernel log buffer size" and it's in "General setup".
>
> or you can just boot with "log_buf_len=256k" on the kernel boot line (e.g.)
>
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
>

Thanks, very useful note!

$ stress --vm 32 --vm-bytes 250M
stress: info: [4087] dispatching hogs: 0 cpu, 0 io, 32 vm, 0 hdd

Mem: 8039576k total, 5288036k used, 2751540k free, 12k buffers
Swap: 0k total, 0k used, 0k free, 37944k cached


$ stress --vm 40 --vm-bytes 250M
stress: info: [4120] dispatching hogs: 0 cpu, 0 io, 40 vm, 0 hdd
Mem: 8039576k total, 6661484k used, 1378092k free, 12k buffers
Swap: 0k total, 0k used, 0k free, 38000k cached

$ stress --vm 42 --vm-bytes 250M
stress: info: [4398] dispatching hogs: 0 cpu, 0 io, 42 vm, 0 hdd
Mem: 8039576k total, 6447048k used, 1592528k free, 8k buffers
Swap: 0k total, 0k used, 0k free, 11148k cached

$ stress --vm 45 --vm-bytes 250M
stress: info: [4352] dispatching hogs: 0 cpu, 0 io, 45 vm, 0 hdd
stress: FAIL: [4372] (494) hogvm malloc failed: Cannot allocate memory
stress: FAIL: [4352] (395) <-- worker 4372 returned error 1
stress: WARN: [4352] (397) now reaping child worker processes
stress: FAIL: [4352] (452) failed run completed in 4s

$ stress --vm 48 --vm-bytes 250M
stress: info: [4303] dispatching hogs: 0 cpu, 0 io, 48 vm, 0 hdd
stress: FAIL: [4323] (494) hogvm malloc failed: Cannot allocate memory
stress: FAIL: [4322] (494) hogvm malloc failed: Cannot allocate memory
stress: FAIL: [4303] (395) <-- worker 4323 returned error 1
stress: WARN: [4303] (397) now reaping child worker processes
stress: FAIL: [4303] (395) <-- worker 4322 returned error 1
stress: WARN: [4303] (397) now reaping child worker processes
stress: FAIL: [4303] (452) failed run completed in 4s

Is there a better way to verify I can use all the available memory?

Justin.
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